https://opensource.ncsa.illinois.edu/bitbucket/scm/u3d/3dutilities https://opensource.ncsa.illinois.edu/bitbucket/scm/u3d/3dutilities/src/main/section1/ntbk.ipynb https://opensource.ncsa.illinois.edu/bitbucket/scm/u3d/3dutilities/src/main/section1/ntbk.ipynb?mode=edit